[css-flexbox-1] Untestable assertions

Section 5
Authors must not use these techniques as a substitute for correct source ordering, as that can ruin the accessibility of the document.

Section 5.4.1
Authors must use ‘order’ only for visual, not logical, reordering of content; style sheets that use ‘order’ to perform logical reordering are non-conforming.

Section 7.1
To avoid misinterpretation or invalid declarations, authors must specify a zero <flex-basis> component with a unit or precede it by two flex factors

We should reword these above assertions so I do not need to test authors that they MUST do something. I think we can easily say ‘recommended’ or ‘should’ or even better ‘are encouraged’. Also we should probably not emphasize the word. Emphasis implies that the words are part of RFC2119.

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Thanks,
Arron Eicholz